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CHAPTER 1: BASIC CONCEPTS ABOUT MATTER 1. Which of the following is a property of both gases and liquids? a. Definite shape b. Indefinite shape c. Definite volume d. Indefinite volume ANSWER: b 2. In which of the following pairs of properties are both properties chemical properties? a. Freezes at 10°C and is nonflammable b. Decomposes at 500°C and reacts with bromine c. Poor conductor of heat and is reddish brown in color d. Has a low density and is very hard ANSWER: b 3. When a substance undergoes a chemical change it is always true that a. it liquifies b. it changes from a solid to a gas c. it is converted to a new kind of matter with a different composition d. the temperature of the substance increases ANSWER: c 4. The description "two substances present, two phases present" is correct for a. heterogeneous mixtures b. homogeneous mixtures c. elements d. compounds ANSWER: a 5. Which of the following statements about heterogeneous and homogeneous mixtures is correct? a. It is possible to have heterogeneous mixtures in which all the components are liquids. b. A homogeneous mixture contains visibly different parts, or phases. c. All of the phases in a heterogeneous mixture must be in the same state. d. No two phases in a heterogeneous mixture can be in the same state. ANSWER: a 6. Which of the following statements is correct? a. Elements, but not compounds, are pure substances. b. Compounds, but not elements, are pure substances. c. Both elements and compounds are pure substances. d. Neither elements nor compounds are pure substances. ANSWER: c 7. An element is a substance that a. can be broken down into simpler substances by physical means. b. cannot be broken down into simpler substances by physical means. c. can be broken down into simpler substances by chemical means. d. cannot be broken down into simpler substances by chemical or physical means. ANSWER: d Copyright Cengage Learning. Powered by Cognero.
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